24A34 Series
Fan/Heat Sequencers
INSTALLATION INSTRUCTIONS
FAILURETO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE.
DESCRIPTION
The 24A34 Series Fan/Heat Sequencer gives the service tech-
nician a direct replacement for sequencing both fan and heat. The terminal markings on the 24A34 sequencers are equivalent
to most other manufacturers’ types.
These sequencers may be wired in series, as shown in wiring diagrams, to allow sequencing of one through seven element furnaces.
! CAUTION
To prevent electrical shock and/or equipment damage, disconnect electric power to system, at main fuse or circuit breaker box, until installation is complete.
Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard.
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SPECIFICATIONS |
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Electrical Ratings - Single Load Contact Ratings (All Models) |
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Resistive (Non-Inductive) |
Motor Ratings (Inductive) |
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VAC |
Watts |
Amps |
Full Load |
Locked Rotor |
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Pilot Duty |
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120 |
3000 |
25.0 |
14.0A |
72.0A |
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125 VA |
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240 |
6000 |
25.0 |
7.0A |
42.0A |
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125 VA |
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480 |
6000 |
12.5 |
– |
– |
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480 VA |
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Electrical Ratings - Single Load Contact Ratings (All Models)
Model |
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Timings – ON |
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Timings – OFF |
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Number |
Timings |
Switches |
M1-M2 |
M3-M4 |
M5-M6 |
M7-M8 |
M9-M10 |
M1-M2 |
M3-M4 |
M5-M6 |
M7-M8 |
M9-M10 |
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24A34-1 |
1 |
1 |
1-20 |
– |
– |
– |
– |
40-110 |
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– |
– |
– |
– |
24A34-2 |
1 |
1 |
– |
– |
30-90 |
– |
– |
– |
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– |
1-30 |
– |
– |
24A34-3 |
1 |
2 |
1-20 ♦ 1-20 |
– |
– |
– |
40-110 |
♦ 40-110 |
– |
– |
– |
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24A34-4 |
1 |
2 |
– |
– |
30-90 ♦ 30-90 |
– |
– |
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– |
1-30 ♦ 1-30 |
– |
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24A34-5 |
2 |
3 |
1-110 ♦ 1-110 |
1-110 |
– |
– |
1-110 |
♦ 1-110 |
1-110 |
– |
– |
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24A34-6 |
2 |
4 |
1-110 ♦ 1-110 |
1-110 ♦ 1-110 |
– |
1-110 |
♦ 1-110 |
1-110 ♦ 1-110 |
– |
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24A34-14 |
4 |
5 |
1-160 ♦ 1-160 |
1-160 |
1-160 |
1-160 |
1-160 |
♦ 1-160 |
1-160 |
1-160 |
1-160 |
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24A34-15 |
1 |
1 |
1-60 |
– |
– |
– |
– |
75-95 |
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– |
– |
– |
– |
TABLE NOTES:
M1-M2 and M3-M4 are always first switches to turn ON and last to turn OFF. All other switches are random ON and random OFF24A34-14 Switch contacts designated F1 - F2 instead of M1 - M2
♦ These contacts switch simultaneously
NOTE: Underwriters Laboratories requires a fan interlock circuit to insure the blower remains operating whenever more than one sequencer is used. The fan interlock should be the M1 / M2 contacts of the second or third sequencer. All M1 / M2 contacts are wired to the blower motor so that any sequencer that is energized will keep the blower ON.
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PART NO. 37-4800C |
www.white-rodgers.com |
Replaces 37-4800B |
www.emersonclimate.com |
1050 |
FAN DELAY OFF
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WIRING |
I |
2 |
Normally close |
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3 |
Normally open |
H |
H |
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(One Timing)
24A34-15
FOR ONE ELEMENT FURNACES
COMBINATION Fan and Heater Loads
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WIRING |
ONE POLE |
M1 |
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M2 |
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To 1st element & fan |
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H |
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H |
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To 24 VAC wall thermostat |
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(One Timing)
24A34-1 / -2
SEPARATE Fan and Heater Loads
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WIRING |
M1 |
M2 |
To fan |
TWO POLE M3 |
M4 |
To 1st element |
H |
H |
To 24vAC wall thermostat |
(One Timing)
24A34-3 / -4
FOR TWO ELEMENT FURNACES
COMBINATION Fan and Heater Loads
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WIRING |
M1 |
M2 |
To 1st element & fan |
TWO POLE M3 |
M4 |
To 2nd element |
H |
H |
To 24vAC wall thermostat |
(One Timing)
24A34-3 / -4
SEPARATE Fan and Heater Loads
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WIRING |
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M5 |
M6 To 2nd element or aux. contacts |
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ONE POLE |
H |
H |
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M1 |
M2 |
To fan |
TWO POLE |
M3 |
M4 |
To 1st element |
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H |
H To 24vAC wall thermostat |
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(Two Timings) |
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24A34-5 |
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DOTTED LINE BETWEEN "H" TERMINAL
IS A FACTORY-INSTALLED JUMPER
WIRING DIAGRAMS
FOR THREE ELEMENT FURNACES WITH COMBINATION FAN & HEATER LOADS
SINGLE-STAGE Room Thermostat
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WIRING |
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M5 |
M6 |
To 3rd element |
ONE POLE |
H |
H |
To 24vAC wall thermostat |
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M1 |
M2 |
To fan & 1st element |
TWO POLE M3 |
M4 |
To 2nd element |
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H |
H |
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(Two Timings)
24A34-5
TWO-STAGE Room Thermostat Option
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WIRING |
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M5 |
M6 |
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TWO POLE |
M7 |
M8 |
To 3rd element |
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H |
H To 24vAC wall thermostat |
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M1 |
M2 To fan & 1st element |
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TWO POLE |
M3 |
M4 |
To 2nd element |
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H |
H |
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(Two Timings) |
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24A34-6 |
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FOR THREE ELEMENT FURNACES WITH SEPARATE FAN & HEATER LOADS
SINGLE-STAGE Room Thermostat
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WIRING |
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M5 |
M6 |
To 2nd element |
TWO POLE |
M7 |
M8 |
To 3rd element |
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H |
H |
To 24vAC wall thermostat |
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M1 |
M2 |
To fan |
TWO POLE |
M3 |
M4 |
To 1st element |
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H |
H |
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(Two Timings)
24A34-5
TWO-STAGE Room Thermostat Option
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WIRING |
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M1 |
M2 |
To fan interlock |
TWO POLE |
M3 |
M4 |
To 3rd element |
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H |
H To W2 of 24vAC wall thermostat |
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(One Timing) |
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24A34-3 / -4 |
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M5 |
M6 To common of 24v transformer |
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TWO POLE |
M7 |
M8 |
To 2nd element |
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H |
H To W1 of 24vAC wall thermostat |
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M1 |
M2 |
To fan |
TWO POLE |
M3 |
M4 |
To 1st element |
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H |
H |
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(Two Timings)
24A34-6
2